package Chapter07;

import java.util.*;

public class  Question1 {
    public static void main(String args[]) {
            Scanner reader = new Scanner(System.in);
            double sum = 0;
            int m = 0;
            while(reader.hasNextDouble()){
                double x = reader.nextDouble();
                assert x<=100&&x>=0:"数据不合理";
                m = m+1;
                sum = sum+x;
            }
            System.out.printf("%d个数的和为%f\n",m,sum);
            System.out.printf("%d个数的平均值是%f\n",m,sum/m);

    }
}